2,7-Naphthalenedisulfonic acid, 3,3'-(iminobis(4,1-phenyleneazo))bis(5-(benzoylamino)-4-hydroxy-, sodium salt 85223-30-9 Azo dye compd. Disodium 3,3'-(iminobis(4,1-phenyleneazo))bis(5-(benzoylamino)-4-hydroxynaphthalene-2,7-disulphonate) EINECS 286-385-8